基于岩石表面电阻率测量的碳酸盐岩缝洞定量表征

doi:10.7657/XJPG20250512

摘要/Abstract

摘要：

四川盆地震旦系灯影组碳酸盐岩储集层的显著非均质性，给缝洞型储集层微电阻率扫描成像测井解释带来了较大挑战。为提高成像测井在碳酸盐岩缝洞型储集层评价的精度，结合AutoScan-Ⅱ岩心电阻率扫描实验，设计并制做岩心表面电场测量装置，开展岩石表面电阻率测量与成像实验，定量分析不同孔洞和裂缝的成像响应规律，并建立基于岩石表面电阻率分布的缝洞参数标定方法。结果表明：随着岩心测量孔洞直径和面孔率增大，成像计算孔洞直径和面孔率均分别呈线性增大；随着岩心测量裂缝宽度和面缝率增大，成像计算裂缝宽度和面缝率均分别呈对数增大。室内岩石表面电阻率实验可有效降低岩心测量与成像测井计算结果的误差，实现缝洞面孔率精确标定与定量评价。研究为提高成像测井在缝洞型储集层评价的可靠性和准确性提供了思路，并为碳酸盐岩储集层评价与开发提供了技术支撑。

关键词: 四川盆地, 灯影组, 碳酸盐岩, 岩石表面电阻率测量, 成像测井, 缝洞, 面孔率

Abstract:

The significant heterogeneity of the carbonate reservoirs in the Sinian Dengying formation in the Sichuan Basin poses substantial challenges to interpretation of microresistivity scanning image logging for the fractured-vuggy reservoirs. To enhance the accuracy of imaging logging in evaluating fractured-vuggy carbonate reservoirs, a core surface electric field measurement device was customized based on AutoScan-Ⅱ core planar resistivity scanning experiments. Using this device, experiments on rock surface resistivity measurement and imaging were conducted to quantitatively analyze the imaging response characteristics of vugs and fractures. A calibration method for fracture-vug parameters based on rock surface resistivity distribution was established. The results show that the computed vug diameter and plane porosity increase linearly as the core-measured vug diameter and plane porosity increase, and the computed fracture width and the surface fracture ratio increase logarithmically as the core-measured fracture width and surface fracture ratio increase. The laboratory-based rock surface resistivity experiments effectively reduce the discrepancies between core measurements and imaging logging calculations, enabling precise calibration and quantitative evaluation of plane porosity of fractures and vugs. This study provides a methodological framework for improving the reliability and accuracy of imaging logging in evaluating fractured-vuggy reservoirs, and offers technical support for the evaluation and development of carbonate reservoirs.

Key words: Sichuan Basin, Dengying formation, carbonate rock, rock surface resistivity measurement, imaging logging, fracture-vug, plane porosity

中图分类号:

TE122

李梦帆, 唐军, 郑辰昌, 杜国豪, 王采薇. 基于岩石表面电阻率测量的碳酸盐岩缝洞定量表征[J]. 新疆石油地质, 2025, 46(5): 614-621.

LI Mengfan, TANG Jun, ZHENG Chenchang, DU Guohao, WANG Caiwei. Quantitative Characterization of Fractures and Vugs in Carbonate Rocks Based on Rock Surface Resistivity Measurements[J]. Xinjiang Petroleum Geology, 2025, 46(5): 614-621.

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岩心来源	孔洞直径/mm		面孔率/%
岩心来源	岩心测量	成像计算	岩心测量	成像计算
PT1井	23.98	31.73	5.204	9.531
PT1井	3.10	6.12	1.239	1.329
PS7井	6.76	9.60	5.252	10.760
L1井	3.71	8.42	0.595	2.927
L1井	2.64	6.61	0.358	2.164
L1井	9.36	15.09	3.308	10.271
L1井	10.94	17.86	3.934	13.940
人造岩心	4.08	7.72	1.676	5.554

岩心来源	裂缝宽度/mm		面缝率/%
岩心来源	岩心测量	成像计算	岩心测量	成像计算
PS7井	6.32	12.21	6.687	14.573
L1井	1.43	8.19	1.707	6.213
L1井	1.61	10.02	1.973	8.408
L1井	1.85	7.67	4.149	10.966
L1井	1.54	7.05	2.717	9.730
人造岩心	0.37	2.69	0.742	2.257